allow sending diagnostic logs from client

[JanCaha]

Sending of logs should be handled by python client. That should take responsibilities of Mergin QGIS plugin, which should only pass paths to log files and necessary info.

Adds two helper functions - server_config() and server_version_newer_or_equal_than() which should be useful in the long term. server_version_newer_or_equal_than() might need some more robust check if the passed required_version is a correct string.

[MarcelGeo]

Looks good.

I am not sure if we need another version support function :)

[coveralls]

Pull Request Test Coverage Report for Build 15631070300

Details

• 47 of 57 (82.46%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 80.047%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
mergin/client.py	25	35	71.43%

Totals
Change from base Build 15386659816:	0.03%
Covered Lines:	3426
Relevant Lines:	4280

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💛 - Coveralls